My instructors were trained by Don Buck, who was the head of the American Kyokushin Karate Organization. When Don Buck passed away, Fred (his son, though not raised by him, I don't think,) took over the AKKO. Fred was a different person who focused on different things than Don, and there were some philosophical differences between him and my instructors, so they broke away from the AKKO.

So, we were affiliated with Don Buck and the AKKO when the organization was his. We are not affiliated with Fred Buck.

PS, I am not a representative of my dojo or organization. :p So I don't officially speak for them. But that's the way it is, anyway.